Take them swimming. Have them star a business. Have them design a website to voice their ideas and opinions. Take them to the symphony. Take them out of the city and expose them to other ways of living. Have them play a sport together. Or help out Habitat For Humanity. Teach them chess and have tournaments. Have them draw/create art or something else along those lines. Kids just need a positive influence. Usually, that translates into being sincere and showing them that you really care about them and their future.